Overcurrent protection circuit and method thereof

Abstract

An overcurrent protection method is provided. The overcurrent protection method is applied to a USB with a PD function. The overcurrent protection method includes the steps of converting an input voltage into a first voltage to provide power to the first electronic device; determining whether the working current of the first electronic device is greater than a first default value; determining whether the working current of the first electronic device is greater than a second default value; in response to the working current being greater than the first default value, a first sensing signal is generated to disable a switch and to form an open circuit between the first electronic device and the second electronic device; and in response to the working current being greater than the second default value, conversion of the input voltage into the first voltage is stopped.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This Application claims priority of CN Patent Application No. 201810947568.2 filed on Aug. 20, 2018, the entirety of which is incorporated by reference herein.BACKGROUND OF THE INVENTIONField of the Invention[0002]The invention generally relates to an overcurrent protection circuit and method. Description of the Related Art[0003]In order to make progress of the field of electronic device manufacturing, the requirements for the power transmission ability and the data transmission velocity of the transmission interface are being increased. In a universal serial bus (USB) with a power delivery (PD) function, the data transmission combined with the high-power power source makes the volume of the connector become smaller, and makes the use of the connector become more convenient. However, because the new transmission interface (i.e. the USB with a power delivery function) provides a charging function, the rush current may cause damage to the e...

AI Technical Summary

Benefits of technology

The patent text discusses the increasing requirements for power transmission and data transmission in electronic device manufacturing. The use of the universal serial bus (USB) with power delivery function has led to smaller connectors and more convenient use. However, the high-power power source may cause damage to electronic devices. To prevent such damage and meet requirements for system compatibility, a protection mechanism needs to be established to ensure the safety of electronic devices.

Problems solved by technology

However, because the new transmission interface (i.e. the USB with a power delivery function) provides a charging function, the rush current may cause damage to the electronic device.

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